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Out of my league and time is up. Cannot get it work on non-GL. Something
is wrong with the math, no idea what.

...not yet finished.

Shaders and camera logic not yet there.

It is essential to have a test that exercises depth-only passes and
rendering into a depth texture that is then used in another pass. Some
simple shadow casting directional light is a good example for this.

...when running on gles 3.0+ or gl.

This is a convenience to allow renderers to figure out the sample
count for their pso by just querying renderTarget()->sampleCount()
where the render target is set up and provided from another component
outside of the renderer's knowledge and control.

These may be used by Q3DS for HDR images (IBL).

do not reimplement the same logic that is already there in
qopenglfunctions.cpp

...so that setting QRhiSwapChain::sRGB behaves identically between
all 4 backends.

Partial (source size specified) 32-bit uploads no longer read
potentially out of bounds.

8 and 16 bit formats give correct results even when the source
stride is not 4 byte aligned.

The order is important here, if there are multiple operations
targeting or reading from the same texture.

Inspired by QObject::deleteLater()...